shedlock



3 Sheets-Sheet l.

(No Model.)

A. SHEDLOCK.

BLEGTRICARG LAMP.

Patented May 8. 1883.

(No Model.) 3 Sheets-Sheet 2.

A. SHEDLOK.

ELECTRIC ARG LAMP.

N0. 277,167. Patented May 8,1883.

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(No Model.) 3 Sheets-Sheet 3. A. SHE'DLOGK.

ELECTRIC ARG LAMP. No.' 277.167. Patented May 8,1883.

Mmses N. PETERS Phulo-Lithagmphar. Wnhingmn. D. c.

arc becomes extinguished. To further insure vthe proper action ol' this style of arc regulating and forming device, and to produce a perfect arc lighting system, the independent automatic cut-out and regulator shown at Fig. 4 is employed. This device, which is entirely independent of the lamp, is designed to beplaced in some convenient position to be of easy access; and it consists of a resistance, 7', about equal to the resistance of the arc and the lead wire, one end of which is joined to the positive wire kot' the main circuit and the other end to a contactblock,j. Another contact-block,j2, is connected to the negative Wire lr of the main circuit, and this block is ,connected to the block 7", to close this shunt-circuit, by means ot' the bridge-piece l, pivoted to the end ofthe lever l', said closing beingcaused by the spring l2. To the other end of the lever Z is secured anV armature, m, which is acted uponby the iron core of the magnet'n. This magnet is wound with large wire, so as to have no perceptible resistance, and is included in the lead wire o, which conveys the positive current to thelamp, the return-wire o from thelamp beingjoined to thecontact-blockfof'the wire k ofthe main circuit.

p represents a key or switch, by means ot' which thelampircuit may beopened or closed. When this key is moved back, as shown by the dotted lines, the bridge-piece l closes the circuit having the resistance j. Itl the lamp is in position ready to be used with the carbons in Contact, and the key p be closed, the magnet n attracts the armature m and opens the shunt resistance, j, circuit, causing the whole current to dow through the lamp, the arc of which is then formed by reason of the portionl ot' the current which flows through the magnetfin the derived circuit. As long as the lamp is working properly the magnet 'n keeps the resistancej-outof circuit; butshould the arc become extinguished the lever' Ziis instantly released, as the current then passing throughn is not sufficient to counteract the spring l2, and the bridge-piece lcompletes the shunt resistance, j, circuit. The carbons are allowed to close, as before described, which reduces the current in the magnetf, andalsoin resistancej, and charges the magnet n sufv ciently to open theresistance j circuit. This action of the magnet u is retarded to allow the armature of the magnetj' to fall and grip the rod c', to be ready to forma new arc as soon as all the currentis caused to pass through the lam p-circuit. This retardation of the action of the magnet n to open the bridge-piece l is accomplished by slottin g the connecting-hole of l to ylever Z,so that thelever Zhas to bemoved -a considerable distance before the bridge-piece l is raised. A dash-pot or other retardingdevice may be connected to the lever Z; but such will not generally be necessary.

It will be observed that while this independent automatic cut-out and regulator is particularly adapted "to be used in combination with the lamp above described, it may with advantage be used with other electric lamps.

What I claim, and desire to secure by Letters Patent, is

l., In an electric lamp, in combination, an electro-magnet in a branchcircuit around the arc-circuit, a rotating armature, a clamp device carried by the armature, and two adjustable stops adapted to open the clamp device when the armature is in its two extreme positions, substantially as and for the purpose set forth.

2. In combination, the carbon-holding rod e', the hollow-core magnetf, having a toothed head, the armature g, also having toothed projections, and provided with a clampingdevice, and the supporting-rods g g g', substantiall y as set forth.y

3. An electro-magnet in which a prolongation of one of its poles is free to be acted upon by the other to be moved thereby, having the following elements in combination: upper pole, f2, base-pole, round end rods, g g g', of iron, resting in recesses in the base-pole, and armature g, resting on the rods g' g g', substantially as set forth.

4.- In combination, the clamp h, stops i and i', carbon rod e', armature g, hollow-core electro-magnet f j" f2, and supporting-rods g'g g', substantially as set forth.

5. In combination, the cla-mp h, stops t' and i', carbon rod e', armature g, hollow-core electro-magnetfffz, supporting-rods g g g', and spring i2, substantially as set forth.

6. In combination,the lower carbon rod supporting-bars b 11, the globe c, and the hooks c I CO c c', pivoted to the bars b b b, so as to hold l the globe positively by catchingA under the flange around its opening, substantially as set forth. I Y

7. The resistance j, contact-blocks jjz, in combination with the main circuitklc and the spring-acting lever l', with the bridge-piece l and the magnet mincluded in the lamp-circuit o o', substantially as set forth.

In testimony whereof I have hereunto set my hand, at New York, county and State of New York, this 6th day of October, A. D. 1882.

ALFRED SHEDLOCK. Witnesses:

H. D. WILLIAMS, E. G. BAKER,

l UNITED STATES PATENT OFFICE,

ALFRED sHEDLooK, or BROOKLYN,

NEW YORK, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE STAR ELECTRIC LIGHT AND POWER COMPANY OF THE UNITED STATES.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 277,167, dated May 8, 1883.

Application filed October 7, 1882. (No model.)

To all whom it may concern:

Bc itA known that I, ALFRED SHEDLocK, of Brooklyn, county ofKings', State of New York, have invented certain new and useful Improve ments in Electric-Arc Lamps, of which the following is a specification.

This invention relates to that type of electric-arc lamps in which the lower carbon is stationary and the upper carbon fed by gravity 1o to maintain the arc.

' rI-he invention embracesimprovements inthe lamp by which perfect control of the arc is had, and also an improved independent automatic cut-out and auxiliary regulator and key, ar-

. ranged to be ot' easy access and located at a distance from the lamp.

The improvements in the lamp consist of a clamping device for holding the upper carbon rod, carried or controlled by the armature ot' zo an electro-magnet of high resistance relatively to the arc included in a shunt-circuit, the main lamp-circuit including nothing but the arc and carbon rods. To enable this'derived electromagnet to act to form the arc, and to control the downward movement of the upper carbon rod, the clamp is so constructed and actuated by the movement vofthe armature ofthe magnet as to release the rod when no current is passing through the magnet, and also when the cur- 3o rent therein is at the maximum, which occurs when the resistance ofthe arc increases above the normal and when the arc becomes extinguished. With a normal arc the armature is so adj usted that the carbon-rod clamp carried or controlled thereby is floating between the stops or guides which operate it, so that a variation of' the current in either direction causes the clamp to act to release the rod.

The independent automatic cut-out and reg 4o ulator consists of an electro-magnet whose in.

' ducing conductor consists ofa few convolutions ot' large wire forming part of the lamp-circuit, to the armaturelever of which are connected contact-points, which complete a shunt-circuit 4 5 having a resistance about equal to the branch of the main circuit, including the arc of the lamp. The power of this magnet is such that the resistance shunt-circuit isopeu when the as the lamp-circuit increases in resistance bevbeing such that sufficient current tlows therelamp-circuit resistance is normal; but as soon youd the working resistance due tothe extinction of the are, &c., then the shunt is closed, and the current through the derived circuitin the lamp, increasing at the same time, opens the clamp and allows the carbon to come in 55.

contact. Then for a short interval of time the shunt resistance circuit is in multiple circuit with the carbons andthe derived clamp-governing circuit. Consequently the current to the derived clamp-governiu g circuit is reduced, and the armature of its magnet allowed to recede before the large wire magnet of the automatic'cut-out acts on its armature to open the resistance shuntcircuit, which, when done, throws all the current into the lamp-circuit. The are is then instantly-formed bythe increase ot' current in the derived clamp-governing circuit, the resistance of the helix and number of convolutions around the core of the magnet 7o through when the carbons are in Contact to cause the armature to raise the upper carbon rod. An ordinary key is arranged to cut out the lamp-circuit as desired, allowing the whole of the current to pass through the shunt-cir. cuit, having a resistance equal to the lamp-circuit, so that under all circumstances the maincircuit resistance is constant, irrespective ot the number of arcs burning. The construction of the lamp is such that the same is very com-V pact, and little or no shadows are cast by the arc.

In the accompanying drawings, Figure 1, Sheet 1,'is a central sectional elevation of the lamp. Fig. 2, Sheet l, is a side elevation of 85 theyarc forming and controlling mechanism. Fig. 3, Sheet l, is a plan view of the same; and Fig. 4, Sheet 2, shows a front view ofthe independent automatic cut-oft' and regulator,

illustrating the connection ot the same with 9o the lamp. Fig. 5, Sheet 3,is an enlarged view ofthe upper part of the lamp with one of the frame-rods broken away, showing the clamp- Y ing device about to be released when the armatures are in the extreme upper position. Fig. 6, Sheet 3, i's aplan of the globe and supporting-rods, showing the rods cut through just above the globe. 

